[john walker's workshop]

it would be good to know the year of your car if you want an accurate assessment. 30 hours is a common labor charge for a valve grind, which includes R+R engine. @$80 per hour, that's $2400.
replacing all the valves is common practice because the stems wear out, as well as the off chance that an exhaust valve will loose it's head, due to overheating in it's previous life. the prices on the valves and springs are way too high. arp rod bolts are a good thing if you're racing. do the rod bearings at the same time. arp head studs are overkill, and not needed on a low horse engine. if you have dilivar lowers, replace them with steel. the labor price is good, if it includes R+R pistons and cylinders. more than good actually.
you should be able to get it done for just over $4000. that's VG, new valves, springs, arp rod bolts, rod bearings, lower steel studs. shop around.